Very nice simple design half ball Inverted Dome.
This Dome will coordinate very well with the more
ornate Cast glass Inverted Domes that you would
see in the Colonial revival houses of the early
20th century, where there was detail like
Torch and Wreath, Bell flower and Egg and Dart.
You could not do the detail in every fixture and you
needed the simple ones to coordinate and provide
light. Three porcelain sockets achieve this very well.